If you're not already in the know, Robinhood allows you to buy and sell U.S. listed stocks and ETFs with $0 commission. When the other guys are charging up to $10 per trade, Robinhood cuts out the fat (empty retail locations, expensive Super Bowl ads) and passes the savings to the customer.

Everything is done in an easy, beautifully designed app (with web access rolling out to customers now) and the entire process of buying and selling stocks is pain-free and frictionless. They even entered the cryptocurrency world, allowing customers to easily buy Bitcoin and other coins alongside their stocks and ETFs. And yes, there are no ridiculous fees with those, either.